Teaspoons to Milliliters

Teaspoons and milliliters

The US teaspoon is a third of a tablespoon: exactly 4.92892159375 milliliters. Baking powder, salt, vanilla and medicine doses are measured in teaspoons; dosing spoons usually use a rounded 5 mL.

The milliliter is one thousandth of a liter, the same volume as one cubic centimeter. Medicine doses, cosmetics, small bottles and metric recipes are measured in milliliters.

Worked example

Convert 2 tsp: 2 × 4.92892159375 = 9.857843188, so 2 teaspoons is 9.857843188 milliliters. Likewise 5 tsp = 24.64460797 mL.

Estimating in your head

Multiply by 4.9 for a quick figure; it is off by about 0.6%. For 2 tsp that gives 9.8 mL, against 9.85784 exactly.

Going the other way

To convert milliliters to teaspoons, divide by 4.92892159375 (or multiply by 0.202884136211). The swap button between the boxes opens that page.

mL = tsp × 4.92892159375

1 tsp = 0.00000492892159375 m³ and 1 mL = 0.000001 m³, both by definition, so the factor is their ratio: 4.92892159375 exactly. Results drop binary floating-point noise beyond 15 significant digits and display at the precision you choose (6 significant figures by default). Copy result copies the full value.